Scratch-gage



(No Model.)

W. G. ROSS.

SGRATGH GAGE. No. 396,371. Patented Jan. 15, 1889.

IIN rED STATES PATENT @rrrcs.

\VILLIAM G. ROSS, OF DECATUR, ILLINOIS, ASSIGNOR OF ONE-HALF TO \VILLIAMA. IIOUUK, OF ROCI'I ESTER, NElV YORK.

SCRATCH=GAGE.

SPECIFICATION forming part of Letters Patent No. 396,371, dated January15, 1889.

Application filed August 9, 1888. Serial No. 282,380. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM G. Ross, of Decatur, in the county of Maconand State of Illinois, have invented a certain new and usefullmprovementin Scratch-Gages; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to thedrawings accompany ing this application.

My improvement relates to devices known as scratch-gages, the objectbeing to mark a line at a given distance from a guiding edge or face andcorresponding therewith.

The invention consists in the construction and arrangement of thedevice, as hereinafter more fully described and definitely claimed.

In the drawings, Figure l is a plan view of the device applied to ahalf-circular block on which the scratch-mark is being made. Fig. 2 is aside elevation of the same. Fig. is a longitudinal vertical section inline d3 of Fig. 1, but in the reversed position. 4 is a verticalcross-section in line y t of Fig. 2. Fig. 5 is a plan similar to Fig. 1,but showing the body or hearing of the device shifted end for end toadapt it for use in connection with notched or irregular surfaces. Fig:6 is a section through the adjusting devices, showing a modification ofthe same.

A indicates the body or bearing of the device, the same consisting of ahead-plate, a, a pointed rear end, I), and a half-circular body portion,0. The working parts are all mounted in this frame.

B is a rod or shaft running freely through holes or sockets in the bodyA and capable of movement forward and back. On one end is mounted a thinscratch-edge, (7, by which the scratch-line is made.

C is a small screw-shaft mounted in the block A above the rod B andparallel therewith. This screw-shaft is fixed in position, beingembedded or attached in the opposite shoulders of the block.

D and D are two ad usting-nuts, which screw back and forth on the screw.

E is a slotted clamp, the same being formed with an eye, f, at thebottom, through which the rod B passes, and two jaws, g g, which extend16p face to face and loosely embrace the screw at the top. A thumbscrew, h, passes through the jaws g g, as shown in Fig. 4. 'When thethumb-screw 7b is turned up, the clamp will be tightened on the red; butwhen loosened the rod can slide freely forward and back independently ofthe clamp.

i is a spiral or other spring 011 the rear side of the clamp,.thetendency of which is to force the clamp forward.

The rod is gaged by loosening the clamp and sliding the rod in or outtill the proper adjustment is attained and then tightening the clampagain, the nuts I) D being set so as to hold the clamp and prevent itfrom moving longitudinally. To produce extra nicety of adjustment, thenuts D D are then screwed forward or back on the screw 0, which causesthe block A to be correspondingly moved for,- ward or back, thusadjusting the gage with the greatest exactness. .If desired, the formshown in Fig. 6 may be used, in which the nut Dhas a sleeve, K, withshoulders at both ends, forming a sort of spool, around which the jawsof the clamp rest, and the other nut D abuts against it. This preventsthe clamp from coming in contact with the screw. The same result will beobtained in both cases. The rod B passes through the block A one side ofthe vertical center, thereby forming a long gage-lip, m, and a shortone, on. The device can be used either side up, making the long or theshort lip act as the gage. By this means the device can be used in agreat variety of places, and can be given a greater range for accuratework. The different lengths of the gage-lips enable them to be used ondifferent kinds of work where one lip alone would not answer. The springi acts as a follower to force the clampforward as fast as the adjListing-nut is turned forward.

The rear end of the block A is made pointed or wedge-shaped, as shown ath. hen clesired, the block can be changed end for end, so as to bringthe pointed end forward, as shown in Fig. 5. The pointed end then formsthe gage, and has all the advantages of the long and short gage-lips. Bythis arrangement the device can be used on notched, corrugated, orirregular surfaees-such as are shown in Fig. 5-the point entering suchnotches or indentations where the square gage could not enter.

ice to'carpenters, machinists, and other workers in wood and metal, asit enables a fine adjustment to be obtained and follows almost i anyirregularity of surface, and is not liable to get disarranged, when onceset, if thrown g l The device above described is of great servdown 0.11the bench, or from other rough usage. Having described my invention,what I claim as new, and desire to secure by Letters Patent, is e I 1.In a scratch-gage, the combination of the block A, the rod ll, extendingthrough the same and provided with the scratch-point (I, the screw 0,the adjusting-nuts D D, slotted clamp E, and the thumb-screw 71,arranged to

